Expansion pulley



Jan. 16, 1934. J. R. HERTENSTEIN EXPANS I ON PULLEY Filed June 25, 1932Patented Jan. 16, 1934 L943fl orrsb STATES i i-it Jacob R. Hertenstein,Nashville, Tenn, assignor to Nashville Machine and Supply Company,Nashville, Tenn., a corporation of Tennessee Application June 25, 1932.Serial No. 619,177

4 Claims. (Cl. 64-8) My invention relates to expansion pulleys ofpresent invention relates gives a better lay of the the type in whichthe driving member consists thread than either the usual flat belt orthe gear of an expansible elastic rim which is connected drive, becausethe equalization of belt tension or to the hub member in such mannerthat it may slip seems to take place continuously, or sub- 5 be expandedand contracted to vary its engagestantially continuously, rather thanintermittentco ment with the drive belt, such as'the expansible 1y, asin the case of the fiat belt in which no slippulley shown and describedin Wardwell Patent page occurs while five or six turns of thread are No.690,494, dated January 7, 1902. While my inbeing laid and all theslippage then takes place vention may be used for various purposes, itis at once. The V-belt apparently slips sufiiciently 1 particularlyuseful in machines for driving the to prevent the threads from beingwound one spindles upon which are mounted what are immediately over theother in successive layers, termed in the trade cone cores for windingand lays t thr ad a enough pa t s that strands of textile materials,particularly rayon, y W not s a l wh n u wound from the cone in windingmachines used in the textile industry. C

15 In machines in common use for the purpose indi- I tta e bj t Of y i vt and a cated, the most common practice is to use what plish h ds inView by a simp eiTiCient and are termed gainer pulleys, with expansibleinexpensive construction of the rim of a gainer rims arranged tocooperate with fiat belts arpul y adapt d t p rat t a -s ap d ranged todrive pu11eys on th spindle shafts, belt as hereinafter fully described,and in prac- 20 such as the Wardwell pulley above mentioned, tice mynovel driving device, so constructed, has but these fiat belts are opento certain objections been found 5 give y pe su ts. The by reason ofwhich they are not entir ly ari essential elements of my invention arehereinfactory. A drive of this kind lays five or six f r moreparticularly pointed out in the apthreads rather too close together onthe cone p d d a 25 core, and the next turn is spaced a considerable Inthe drawing, Figure 1 is a diametrical secdistance from the otherthreads. As a result of tion of a pulley embodying my invention. thethreads being laid too close together, they Fig. 2 is a side view of thesame shown conoccasionally snarl up when being unwound at e d by aV-SheDedbelt With a p y 011 a the knitting mills which buy and use thewound driven shaft, such as thecone core shaft 'of a 30 rayon. Thisresults in inconvenience, loss of time winding ac n d I and defectivework at the knitting mill, and loss 3 i a p p t of a we of four p to theproducer of rayon in replacing defective used to expand the rim of thepulley which is cones. The inherent defect in this drive is bespeciallyformed to restrain it from rotation upon lieved to be due to adifference in tension on the the hub.

as driving and slack side of the belt which takes Like referencecharacters indicate like parts place until a slippage equalizing thetension in all the figures of the drawing. occurs, and this results in aperiodical wide Describing now in detail the construction of spacing inthe turns of the thread being wound. my novel expansion pulley, the hub1 of the A positive gear drive for rotating the cone pulley is securedto the pulley shaft, driven in any H 40 cores has been tried, but thisis objectionably suitable manner. This hub consists of an exa expensive,and is so positive in uniformly spacing teriorly threaded centralportion 2 connected at the turns of the thread that each thread is laidone side to an amiular outer portion 8, which latdirectly on top of aturn beneath, without any ter is formed with radial bores, in thepresent inlead. This materially reduces the amount of stance four innumber, arranged to receive pins,

45 rayon that can be wound on each cone core. The three of them marked 4and one marked 10 on geared drive is furthermore not adjustable. thedrawing,having their inner ends beveled in The principal object of thepresent invention is such manner as to cooperate with the outer toenable the spindles of the cone cores to be coned face of an interiorlythreaded adjusting driven by means of a relatively narrow belt sleeve 5mounted on the threaded portion of the 50 having inclined side faces,commonly referred to hub and extending into the space between such asV-belts, which shall be free from the objecthreaded portion and theannular outer portion.

tionable slippage and irregularity inherent in This adjusting sleeve isprovided with a knurled flat belts, and which also shall be free fromthe end 6 by which it may be turned to force the pins objectionsincident toapositive gear drive. It has 4 and 10 outwardly, or permitthem to shift inbeen found that the V-belt drive to which my wardly. '1

The outer ends of these pins are headed, and the outer faces of theheads shouldered so as to seat non-rotatably in a channel cut in theinner face of the split rim member 7 hereinafter described, so that thebeveled inner ends of the pins will at all times be maintained incooperative relation to the coned face of the adjusting sleeve and sothat the split rim will be held in place on the hub members thus fardescribed and restrained from axial displacement.

The split rim 7, to which my invention more particularly relates, isformed of spring metal and includes an inner spring section 8 extendingcontinuously around the hub from its ends at the transverse split of therim marked 9, and is formed with a central channel on its inner face, asabove described. To prevent rotative slippage of the rim, the head ofone of the pins, in the present instance the one marked 10, opposite thegap 9 (see Figs. 2 and 3) is formed with a recess adapted to receive arib 11 extending across the channel at that point. Extending outwardlyfrom the spring portion 8 of the rim are two series of arcuate flangesections 12 which are arranged in opposite divergent relation andtogether form a substantially continuous beltreceiving channel adaptedto receive the V- shaped belt 13 which transmits power to the drivenpulley 14 on the bobbin shaft. It will be noted that the spring sectionof the rim is flat and thin, whereby maximum flexibility and resiliencyis attained, and that the bases of the flange sections stand between thecenter line of the rim and its outer edges, so as to provide a properbelt-receiving channel for the relatively thick and narrow belt. It willalso be noted that the slots or gaps between the flange portions 12 ofthe belt groove permit the rim member to expand evenly and in somemeasure they also increase the gripping engagement between the belt andpulley. It is obvious that as the belt wears or stretches the spring rimcan be expanded or allowed to contract through its inherent resiliencyto adjust to a nicety its engagement in the channel of the pulley rim,and a much improved efficiency and regularity of function of the drivingconnection is thereby attained, as compared with any other form ofdriving device heretofore employed.

I claim:

1. In an expansible pulley including a hub member and a series of radialpins slidingly mounted in said hub member and means for equally shiftingsaid pins radially, a transversely split rim member connected with theouter ends of said radial pins and formed with a spring inner section,and two series of arcuate flange sections arranged in opposite divergentrelation together forming a substantially continuous beltreceivingchannel adapted to engage a V-shaped belt, whereby expansion of thespring inner sec tion of said rim member will vary the effectivediameter of the belt-receiving channel formed by said arcuate flangesections.

2. In an expansible pulley having a hub member, a transversely-split rimmember connected with said hub member, said rim member being formed witha spring inner section and two series of arcuate flange sectionsarranged in opposite divergent relation together forming a substantiallycontinuous belt-receiving channel adapted to engage a V-shaped belt,means for expanding said rim member, the expansion of the spring innersection of said rim member acting to vary the effective diameter of-thebeltreceiving channel formed by said arcuate flanged sections, and meansfor restraining movement of said rim member in an axial direction.

3. In an expansible pulley having a hub member, a transversely-splitspring metal rim member connected with said hub member, said rim memberbeing formed with a flat thin inner section and two series of arcuateflange sections integral at their base with said inner section andarranged in opposite divergent relation together forming a substantiallycontinuous belt-receiving channel adapted to engage a V-shaped belt,means for expanding said rim member, the expansion of the spring innersection of said rim member acting to vary the effective diameter of thebelt-receiving channel formed by said arcuate flanged sections and meansfor restraining movement of said rim member in an axial direction.

4. An expansible pulley structure according to claim 3 in which thebases of said flange sections are formed severally intermediate thecenter line of the rim and the. outer edges of said rim.

JACOB R. HERTENSTEIN.

lid 1

